dunno about the best, but my favourite at the moment would have to be Liam Gallagher (though his brother Noel's technically a better singer). This would only apply to him in the 1990s, though, as he's rarely sounded good since 2000. In my opinion, it all went downhill when he stopped singing "sunshiiiiine".

But in the '90s you really couldn't beat him. Most of the other singers were so dull and boring, and Liam actually sung in a really cool way. He sounded young, fresh, very rock 'n' roll, cool as ****, full of emotion and he stretched out his words in a very unique way.

But, as I said before, many singers are technically better than him.